CVE-2025-68808
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the vidtv driver in the Linux kernel, there is a use-after-free and double-free vulnerability in vidtv_channel_si_init(). After transferring memory ownership to PAT/SDT/EIT tables, local pointers are not nullified, leading to freeing already freed memory on error paths.
Risk Assessment
The organization is at risk of system crash or potential arbitrary code execution by an attacker exploiting double-free to gain control over systems with virtual TV tuners.
Recommendation
Update the Linux kernel to a version containing the fix that initializes local pointers to NULL after memory ownership transfer in vidtv.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: media: vidtv: initialize local pointers upon transfer of memory ownership vidtv_channel_si_init() creates a temporary list (program, service, event) and ownership of the memory itself is transferred to the PAT/SDT/EIT tables through vidtv_psi_pat_program_assign(), vidtv_psi_sdt_service_assign(), vidtv_psi_eit_event_assign(). The problem here is that the local pointer where the memory ownership transfer was completed is not initialized to NULL. This causes the vidtv_psi_pmt_create_sec_for_each_pat_entry() function to fail, and in the flow that jumps to free_eit, the memory that was freed by vidtv_psi_*_table_destroy() can be accessed again by vidtv_psi_*_event_destroy() due to the uninitialized local pointer, so it is freed once again. Therefore, to prevent use-after-free and double-free vulnerability, local pointers must be initialized to NULL when transferring memory ownership.